Nolan Ryan, Rickey Henderson made history on May 1, 1991 - Sports Illustrated

Rickey Henderson Price List - Supercollector Catalog

That Record Will Never Be Broken!”: How Many Unbreakable Records Are There? – Society for American Baseball Research

Nolan Ryan, Rickey Henderson made history on May 1, 1991 - Sports Illustrated

Oakland Athletics Baseball 1991 Vintage Sports Memorabilia for sale

MLB 1991 Year in Review

Corey Kluber Now Finds Himself in a Sticky Situation

Dissecting Nolan Ryan's One-of-a-Kind Legacy, 25 Years After 5,000th Strikeout, News, Scores, Highlights, Stats, and Rumors

Nolan Ryan – Society for American Baseball Research

25 Best Rickey Henderson Baseball Cards — One for Each Year! – Wax Pack Gods

Nolan Ryan – Society for American Baseball Research